我如何在C#中使用构造函数,如下所示:
public Point2D(double x, double y)
{
// ... Contracts ...
X = x;
Y = y;
}
public Point2D(Point2D point)
{
if (point == null)
ArgumentNullException("point");
Contract.EndContractsBlock();
this(point.X, point.Y);
}
我需要它不要从另一个构造函数复制代码...
当我使用Blend 4/5时,我可以为Blend WPF设计器创建扩展,如下所示:
using System.ComponentModel.Composition;
using Microsoft.Expression.DesignModel.Metadata;
using Microsoft.Expression.Extensibility;
using Microsoft.Expression.Platform;
using Microsoft.Expression.WpfPlatform;
namespace Elysium.Extension
{
[Export(typeof(IPackage))]
public class Package : IPackage
{
private IServices _services;
public void Load(IServices services)
{
_services = services;
var platformService = _services.GetService<IPlatformService>();
platformService.PlatformCreated += Register;
}
private void Register(object sender, PlatformEventArgs e)
{
var wpf = e.Platform as WpfPlatform;
if (wpf != null)
{
wpf.Metadata.AddAssemblyGroupMapping(AssemblyGroup.ExtendedControls, "Elysium.Extension");
wpf.InstanceBuilderFactory.Register(new CustomWindowInstanceBuilder());
}
}
public void Unload()
{
}
}
}
在这段代码中,我订阅了IPlatform服务,当它更新时,我通过WPFPlatform对象注册我的自定义WindowInstanceBuilder.
我如何为Visual Studio 2010/2012设计师做到这一点？
谢谢.
wpf designer visual-studio-2010 visual-studio visual-studio-2012
当我创建和使用这样的性能计数器时:
private readonly PerformanceCounter _cpuPerformanceCounter;
public ProcessViewModel(Process process)
{
_cpuPerformanceCounter = new PerformanceCounter("Process", "% Processor Time", process.ProcessName, true);
}
public void Update()
{
CPU = (int)_cpuPerformanceCounter.NextValue() / Environment.ProcessorCount; // Exception
}
...我得到一个异常实例"实例的名称"在指定的类别中不存在,并且不理解原因.
PS代码
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.net>
<settings>
<performanceCounters enabled="true"/>
</settings>
</system.net>
</configuration>
...包含在App.config中.
如何使用min(width, height)/2半径在WPF(没有代码隐藏)中绘制圆圈？
那可能吗？我知道Google广告等服务禁止在桌面应用中投放广告.是否有支持WPF/.NET的服务？
我在我的库中使用了三个类:
public abstract class Base<TFirst, TSecond>
{
public Base()
{
// actions with ID and Data of TFirst and TSecond
}
}
public abstract class First<TFirstID, TFirstData>
{
public TFirstID ID {get; set;}
public TFirstData Data {get; set;}
}
public abstract class Second<TSecondID, TSecondData>
{
public TSecondID ID {get; set;}
public TSecondData Data {get; set;}
}
如何指定TFirst必须从First继承而TSecond必须从Second继承,而不是在Base中使用ID和Data的泛型类型？
像这样:
public abstract class Base<TFirst, TSecond>
where TFirst : First // without generic-types
...
编辑: 在类First,Second我使用TFirstID和TSecondID作为属性.在类Base中我使用此属性.
如何在C#应用程序中获取有关进程(cpu,内存,磁盘和网络使用情况)的信息？
PS System.Diagnostics.Process和System.Diagnostics.PerformanceCounter不提供有关磁盘和网络使用情况的信息.我不使用它.
我想在我的WPF应用程序中禁用Aero Peek(当用户将鼠标放在"显示桌面"按钮上时,我的应用程序必须可见).我使用这个PInvoke签名:
[Flags]
public enum DwmWindowAttribute : uint
{
DWMWA_NCRENDERING_ENABLED = 1,
DWMWA_NCRENDERING_POLICY,
DWMWA_TRANSITIONS_FORCEDISABLED,
DWMWA_ALLOW_NCPAINT,
DWMWA_CAPTION_BUTTON_BOUNDS,
DWMWA_NONCLIENT_RTL_LAYOUT,
DWMWA_FORCE_ICONIC_REPRESENTATION,
DWMWA_FLIP3D_POLICY,
DWMWA_EXTENDED_FRAME_BOUNDS,
DWMWA_HAS_ICONIC_BITMAP,
DWMWA_DISALLOW_PEEK,
DWMWA_EXCLUDED_FROM_PEEK,
DWMWA_LAST
}
[Flags]
public enum DWMNCRenderingPolicy : uint
{
UseWindowStyle,
Disabled,
Enabled,
Last
}
[DllImport("dwmapi.dll", PreserveSig=false)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool DwmIsCompositionEnabled();
[DllImport("dwmapi.dll", PreserveSig=false)]
public static extern Int32 DwmSetWindowAttribute(IntPtr hwnd,
DwmWindowAttribute dwmAttribute,
IntPtr pvAttribute,
uint cbAttribute);
这个用法:
var helper = new WindowInteropHelper(this);
helper.EnsureHandle();
if (API.DwmIsCompositionEnabled())
{
var status = Marshal.AllocCoTaskMem(sizeof(uint));
Marshal.Copy(new[] {(int) API.DWMNCRenderingPolicy.Enabled}, 0, status, 1); …我有3个配置项目:
项目C具有依赖关系中的B,并且B具有依赖关系中的A. (A < - B < - C)
我使用*.bat文件从命令行构建它:
msbuild A.csproj /target:Build /property:Configuration=Debug;Platform=AnyCPU /verbosity:minimal
msbuild A.csproj /target:Build /property:Configuration=Release;Platform=AnyCPU /verbosity:minimal<br/>
msbuild B.csproj /target:Build /property:Configuration=Debug;Platform=AnyCPU /verbosity:minimal
msbuild B.csproj /target:Build /property:Configuration=Release;Platform=AnyCPU /verbosity:minimal
msbuild C.csproj /target:Build /property:Configuration=Debug;Platform=x86 /verbosity:minimal
msbuild C.csproj /target:Build /property:Configuration=Release;Platform=x86 /verbosity:minimal
msbuild C.csproj /target:Build /property:Configuration=Debug;Platform=x64 /verbosity:minimal
msbuild C.csproj /target:Build /property:Configuration=Release;Platform=x64 /verbosity:minimal
并收到错误:
C:\ Windows\Microsoft.NET\Framework64\v4.0.30319\Microsoft.Common.targets(609,5):错误:未为项目"A.csproj"设置OutputPath属性.请检查以确保您为此项目指定了Configuration和Platform的有效组合.Configuration ='Debug'Blatform ='x86'.您可能会看到此消息,因为您正在尝试构建没有解决方案文件的项目,并且已指定了此项目不存在的非默认配置或平台.[A.csproj] C:\ Windows\Microsoft.NET\Framework64\v4.0.30319\Microsoft.Common.targets(609,5):错误:未为项目"B.csproj"设置OutputPath属性.请检查以确保您为此项目指定了Configuration和Platform的有效组合.Configuration ='Debug'Blatform ='x86'.您可能会看到此消息,因为您正在尝试构建没有解决方案文件的项目,并且已指定了此项目不存在的非默认配置或平台.[B.csproj]
我开发了32位和64位Windows的应用程序.我有一个问题:如果我的应用程序是在64位操作系统上从32位进程启动的,那么我的应用程序将以32位运行.我如何将我的C#AnyCPU应用程序重新运行为64位,如果它运行为32位(WOW64)？